Paper production machine

ABSTRACT

A paper production machine includes a sheet formation mechanism having a mixture chamber, a liquid flow line embodied to provide liquid flow to the mixture chamber, a valve for controlling liquid passage in the liquid flow line, and a control unit configured to provide controlling of the valve. The cellulose and liquid mixture, which is needed for production of the wet paper sheet, is kept in the mixture chamber. Accordingly, at least one pressure sensor is provided for measuring the liquid pressure in the mixture chamber. The pressure sensor is configured to transfer the pressure measurements to the control unit, and the control unit is configured to turn off the valve in case it is detected that the pressure measurements received from the pressure sensor exceeds at least one predetermined reference value.

TECHNICAL FIELD

The present invention relates to a sheet formation mechanism having a mixture chamber wherein the cellulose and liquid mixture, which is needed for production of the wet paper sheet, is kept; a liquid flow line embodied to provide liquid flow to said mixture chamber; a valve for controlling liquid passage in said liquid flow line; and a control unit configured to provide controlling of said valve.

PRIOR ART

Invention of paper is one of the inventions which created revolution in history of humanity. From past to today, the usage area of paper increases every passing day. Paper, which is one of the most frequently used materials in daily life, is used in various areas from napkins to construction materials, for instance like printing, photocopy, drawings and packaging. Depending on the increase of usage area of paper, production should be increased and production should be made in a manner meeting consumption.

Paper production is realized by means of paper machines provided to the factory medium. Paper production is directly associated with trees. The round timbers of trees are cut and the shells are peeled and the obtained timbers are divided into smaller particles. The timbers which are turned into small particles are mixed with water and turned into pulp form, and as a result of this, cellulose mixture is obtained. The cellulose mixture turned into pulp form is passed through steps provided to the paper machine in factory medium, and paper is obtained.

Similar processes are also realized in paper machines used in laboratory mediums. During the processes realized in laboratory scale paper machines, since the mechanism, used for mixing the cellulose mixture with water and for forming the wet paper sheet, is insufficient, the processes should be made manually. In the process of mixing the cellulose mixture with water, the amount of water taken into the tube is adjusted by means of an electrode by an operator. During this process, since determination of the water level value is completely dependent on the operator, problems occur like the pulp does not have the sufficient consistence since excessive water or insufficient water is given during paper production, time loss occurrence for obtaining the desired value, etc. Depending on said problems, delays occur in production and time loss occurs. Because of these conditions, efficiency decreases.

As a result, because of the abovementioned problems, an improvement is required in the related technical field.

BRIEF DESCRIPTION OF THE INVENTION

The present invention relates to a paper production machine, for eliminating the abovementioned disadvantages and for bringing new advantages to the related technical field.

An object of the present invention is to provide a paper production machine used in laboratory medium and embodied to provide increase of paper production.

In order to realize the abovementioned objects and the objects which are to be deducted from the detailed description below, the present invention is a paper production machine comprising a sheet formation mechanism having a mixture chamber wherein the cellulose and liquid mixture, which is needed for production of the wet paper sheet, is kept; a liquid flow line embodied to provide liquid flow to said mixture chamber; a valve for controlling liquid passage in said liquid flow line; and a control unit configured to provide controlling of said valve. Accordingly, the improvement of the present invention is that at least one pressure sensor is provided for measuring the liquid pressure in the mixture chamber and said pressure sensor is configured to transfer the pressure measurements to the control unit; and the control unit is configured to turn off the valve in case it is detected that the pressure measurements, received from the pressure sensor, exceeds at least one first predetermined reference value. Thus, the amount of liquid, which is needed for production of a wet paper page, is provided to the mixture chamber with the help of the pressure sensor.

In a possible embodiment of the present invention, a user interface is provided which is configured to provide realization of command input to the control unit.

In another possible embodiment of the present invention, the pressure sensor is positioned in the vicinity of the base of the mixture chamber.

BRIEF DESCRIPTION OF THE FIGURES

In FIG. 1 , a schematic view of the paper production machine is given.

In FIG. 2 , a representative view of the sheet formation mechanism provided in the paper production machine is given.

DETAILED DESCRIPTION OF THE INVENTION

In this detailed description, the subject matter is explained with references to examples without forming any restrictive effect only in order to make the subject more understandable.

The present invention relates to a paper production machine (10) designed with an innovative structure in a manner providing paper production.

With reference to FIGS. 1 and 2 ; said paper production machine (10) comprises a sheet formation mechanism (100) embodied to provide production of the wet paper page. Said sheet formation mechanism (100) comprises a mixture chamber (110) where the cellulose mixture (paper pulp) and water are mixed which are needed for production of wet paper page. There is a liquid flow line (130) which will provide water input to said mixture chamber (110). In order to realize water transfer to the mixture chamber (110) through said liquid flow line (130), at least one opening (140) is positioned between the liquid flow line (130) and the mixture chamber (110). Said sheet formation mechanism (100) comprises at least one valve (120) embodied to control opening and closing of said opening. There is at least one pressure sensor (111) provided in the vicinity of the base of the mixture chamber (110) so as to measure the pressure value of the water accumulated in the mixture chamber (110) as said valve (120) is turned on.

Said sheet formation mechanism (100) comprises a liquid discharge line (160) for discharging of water which is at a predetermined first reference value measured by said pressure sensor (111) provided in the mixture chamber (110). There is a three-way valve (150) provided in a manner controlling water discharge to said liquid discharge line (160). Said three-way valve (150) comprises a first end (151) connected to said liquid discharge line (160), a second end (152) connected to a vacuum line (170) and a third end (153) connected to a free discharge line (180). Said three-way valve (150) is configured to operate at a first position where water passage between the liquid ends is prevented optionally, at a second position where water passage between the first end (151) and the second end (152) is permitted and at a third position where water passage between the first end (151) and the third end (153) is permitted.

The sheet formation mechanism (100) moreover comprises a control unit (200) embodied to control the pressure value of water. Said control unit (200) is moreover embodied to control operation of the valve (120) which provides water input to the mixture chamber (110) and the operation of the three-way valve (150) which provides water discharge from the mixture chamber (110).

There is a memory unit (300) associated with the control unit (200) in a manner permitting data reading and data writing. The subject matter paper production machine (10) is configured to include a user interface (400) embodied to provide command input to the control unit (200).

An exemplary operation scenario of the present invention is described below;

The cellulose mixture is placed onto a body (not illustrated in the figures) in the sheet formation mechanism (100) by means of a user. After the placement process, first of all, the predetermined first reference water pressure value is transferred to the control unit (200) by means of the user interface (400) by said user. Afterwards, the discharge pipe, which is to be used for discharge of the predetermined first reference value of water which will be accumulated in the mixture chamber (110), is selected by the user. For the selection of the discharge pipe, one of the discharge commands is selected by means of free discharge method or by means of vacuuming method provided on the user interface (400) screen. Finally, the user provides determination of the second reference liquid pressure value, at which water should be discharged from the mixture chamber (110), on the user interface (400) screen. The control unit (200) provides keeping in the memory unit (300) the first reference pressure value received from the user interface (400), the liquid discharge method information which is to be used for discharge of water, and the predetermined second reference pressure value which is required for discharging of the water which exists in the mixture chamber (110).

After completion of recording of the first reference pressure value and the second reference pressure value to the memory unit (300), the mixture chamber (110) is waited to be closed. Depending on the closing of the mixture chamber (110), a signal is produced by means of the control unit (200) for turning on the valve (120). In case the valve (120) is turned on, water flow is provided to the mixture chamber (110) through the opening (140) provided on the liquid flow line (130). By means of the pressure sensor (111) provided in the mixture chamber (110), the water pressure in the mixture chamber (110) is measured. The measured values are instantaneously sent to the control unit (200). The control unit (200) compares the water pressure values, coming from the pressure sensor (111), with the predetermined first reference pressure value kept in the memory unit (300). In case the water value, coming from the pressure sensor, is the same as the first reference pressure value kept in the memory unit (300), a signal, which provides turning off the valve (120), is generated by means of the control unit (200). Depending on the produced signal, the valve (120) is turned off. Thus, the predetermined amount of water, which is needed for transforming the cellulose mixture into wet paper sheet, is provided in the mixture chamber (110).

During the duration until transfer of the first reference valued water to the mixture chamber (110), the three-way valve (150) is kept at said first position. Upon reaching of the water, which exists in the mixture chamber (110), to the water level at the first reference value by means of the control unit (200), a signal is generated which will provide opening of the first end (151) for providing water discharge to the liquid discharge line (160). Upon selection of the discharge command with vacuum method before process is started by the user by means of the user interface (400), the three-way valve (150) is permitted to operate at the second position. Thus, the water, which exists in the mixture chamber (110), is removed through the vacuum line (170) by means of vacuuming method. Upon selection of the discharge command with the free discharge method by means of the user on the user interface (400), the three-way valve (150) is permitted to operate at the third position. Thus, the water, which exists in the mixture chamber (110), is removed through the free discharge line (180) in a manner dependent on gravity without needing any additional process in a free manner.

Depending on the discharge of water which exists in the mixture chamber (110), the pressure measurement values of the water, which exists in the mixture chamber (110), are taken from the pressure sensor (111) by means of the control unit (200). The received measurement values are compared with the predetermined second reference pressure value provided in the memory unit (300). The control unit (200) provides automatic opening of the cover provided to the sheet formation mechanism (100) when it is detected that the pressure value of the water, which exists in the mixture chamber (110), is equal to the second reference pressure value.

In an exemplary embodiment of the present invention, for instance, it is determined that the cellulose mixture provided in a first volume and the water provided in a second volume should be mixed. The operator places the cellulose mixture, provided in the predetermined first volume, to the body (not illustrated in the figures) provided on the sheet formation mechanism (100). After the cellulose mixture is placed, the third volume information which is needed for discharging the water which exists in the mixture chamber (110), and the second volume information are entered to the commands defined on said digital screen. The control unit (200) provides keeping of the second volume information and the third volume information, entered to the digital screen, in the memory unit (300).

In case it is detected that the second volume information and the third volume information are kept in the memory unit (300), the valve (120) is turned on by means of the control unit (200). Depending on turning on the valve (120), water input to the mixture chamber (110) through the water pipe is provided. The volume of the water which exists in the mixture chamber (110) is instantaneously measured by means of the pressure sensor. The volume values measured by the pressure sensor are transferred to the control unit (200). The control unit (200) compares the volume values, taken from the pressure sensor, and the second volume value kept in the memory unit (300). In case the water volume, which exists in the mixture chamber (110), reaches the predetermined second volume value, the control unit (200) provides turning off the valve (120). Thus, water input, having the second volume needed for the cellulose mixture at the predetermined first volume, is provided into the mixture chamber (110). Thanks to this, suitable amount of water and cellulose mixture is mixed for the wet paper page.

When the water, which exists in the mixture chamber (110), is equal to the second volume amount, the first end of the three-way valve (150) is opened and the second end (152) associated with the first end (151) is opened by means of the control unit (200). During discharging of the water, the pressure sensor instantaneously measures the pressure value of water which exists in the mixture chamber (110). The measured values are transferred to the control unit (200). The control unit (200) compares the pressure values received from the pressure sensor and the third volume value which is zero and which is kept in the memory unit (300). In case the water pressure in the mixture chamber (110) is zero, the cover provided to the mixture chamber (110) is automatically opened. Thus, the amount of water in the mixture chamber (110) is discharged with the desired proportion, and a wet paper page with desired consistence is formed.

The protection scope of the present invention is set forth in the annexed claims and cannot be restricted to the illustrative disclosures given above, under the detailed description. It is because a person skilled in the relevant art can obviously produce similar embodiments under the light of the foregoing disclosures, without departing from the main principles of the present invention.

REFERENCE NUMBERS

-   -   10 Paper production machine     -   100 Sheet formation mechanism         -   110 Mixture chamber             -   111 Pressure sensor         -   120 Valve         -   130 Liquid flow line         -   140 Opening         -   150 Three-way valve             -   151 First end             -   152 Second end             -   153 Third end         -   160 Liquid discharge line         -   170 Vacuum line         -   180 Free discharge line     -   200 Control unit     -   300 Memory unit     -   400 User interface 

What we claim is:
 1. A paper production machine, comprising a sheet formation mechanism comprising: a mixture chamber, configured for keeping a mixture of cellulose and liquid for production of a wet paper sheet; a liquid flow line, embodied to provide liquid flow to the mixture chamber; a first valve for controlling liquid passage in the liquid flow line; and a control unit, configured to provide controlling of the first valve, wherein at least one pressure sensor is provided for measuring a liquid pressure in the mixture chamber, and the at least one pressure sensor is configured to transfer pressure measurements to the control unit; and wherein the control unit is configured to turn off the first valve when the pressure measurements received from the at least one pressure sensor exceeds at least one first predetermined reference pressure value.
 2. The paper production machine according to claim 1, further comprising a user interface configured to provide realization of command input to the control unit.
 3. The paper production machine according to claim 1, wherein the at least one pressure sensor is positioned in a vicinity of a base of the mixture chamber.
 4. The paper production machine according to claim 1, further comprising: a liquid discharge line for discharging the liquid in the mixture chamber, a second valve connected to the liquid discharge line, wherein the control unit is configured to operate the second valve for discharging the liquid in case the liquid is detected to exist in the mixture chamber and reach the at least one predetermined first reference pressure value.
 5. The paper production machine according to claim 4, wherein the control unit is embodied to provide opening of cover automatically in case a pressure measurement is taken with a second predetermined reference pressure value from the pressure measurements taken from the at least one pressure sensor.
 6. The paper production machine according to claim 4, wherein the second valve is a three-way valve, and the three-way valve comprises a first end connected to the liquid discharge line, a second end connected to a vacuum line, and a third end connected to a free discharge line, and wherein the three-way valve is configured to operate at a first position where water passage between the liquid ends is prevented optionally, at a second position where water passage between the first end and the second end is permitted, and at a third position where water passage between the first end and the third end is permitted. 